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a)równania (9 - 6x + x²)(x² - 1) = 0
(9 - 6x + x²)=0 v (x² - 1) = 0
(x-3)²=0 v x=1 v x=-1
x=3 v x=1 v x=-1
b)nierówności (x² + 7)(x + 2) / x² ≥0
zał.x≠0
(x² + 7)(x + 2) x² ≥0
(x² + 7)=0v(x + 2)=0 v x² =0
x=-2 v x=0
x∈<-2,∞)